Threshold statistics for cell images. Once a cellular image (a) is thresholded (a'), statistics are calculated from the threshold image. For each white pixel the number of pixels adjacent that are also white are counted. Examples of having zero to eight white neighbours are given in (0)-(8). The first threshold statistic is then the number of white pixels with zero white neighbours, the second is the number with one white neighbour, and so on up to eight. These nine statistics are then normalised by dividing each by the total number of white pixels in the threshold image.